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Connect iPhone and your computer using USB.
Do one of the following:
– In the Finder sidebar on your Mac: Select your iPhone, then click General at the top of the window.
– In the iTunes app on your Windows PC: Click the iPhone button near the top left of the iTunes window, then click Summary.
Click Check for Update.
Go to Settings > General, then tap Software Update. If you see two software update options available, choose the one that you want to install. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now.
Back up your device using iCloud or your computer.
Plug your device into power and connect to the internet with Wi-Fi.
Go to Settings General, then tap Software Update.
Choose the software update that you want to install. …
Tap Install Now